Dust-cap.



A. E. BRONSON..

DUST CAP.

APPLICATIUN FllrED SEPT. 15| 1915.

Patented Apr. 16, 1918.

PATENT ernten.

ADELBERT E. BRONSON, 0F CLEVELAND, OHIO.

DUST-CAI?.

Specification of Letters Patent.

Patented Apr. 1e, 191e.

Application'med september 16, 1915. serial No. 50,938.

To all whom/.t may concern Be it known that I ADELBERT E. BnoNsoN, a citizen of the United States, residing at Cleveland in the county of Cuyahoga and 'State of hio, have invented a certain new and useful Improvement in Dust-Caps, of which the following is a full, clear, and ex act description.

This invention relates to dust caps for use in connection with. the inflation valves of pneumatic tires.

It has been customary to make dust caps for the purpose mentioned out of brass, this being done because of the non-rusting and non-corroding properties of brass. Due to certain causes the price of brass is such that it makes the cost of manufacturing these dust caps exceedinglyA high, and much higher than their cost is warranted by the use to which they are put. l

It is, however, desirable to employl brass in thatl portion of the dust cap which is threaded onto Vthe valve or the nut which holds the valve in place, so as to preclude the possibility of the cap rusting to theV part to which'it is attached and so making its removal dicult.y

' The object of this invention, therefore, is to provide avdust cap made in a plurality of 'parts and of different metals. Preferably the portion which is to contact with the valvev stein is of brass, while the other portion.y of thecap is .in the present instance madeof steel. w

Itvwill, of cours`e,ilbe realized that articles of this kind must be made exceedingly cheap, and, of course, are preferably madeof metal because vof the fact that metal is more durable. Because of the requisite low cost of manufacture, these dust caps are usuallymade. by a drawing process, and in the present instance I still form the cap by drawing the parts thereof.

Reference should vbe had to the accompanying drawings forming a part of this specification, in which Figure 1 1s an elevation with portions in section of a finished dust cap; Fig. 2 is an elevatlon wlth portions in section of the component parts of the dust cap; Fig. 3 is an lelevation with portions in section ofa modified form lofv the cap; Fig. 4 is an elevation with portions in section of a different form of cap;'F1g. 5 is an elevation, with portions lln section, ofa part of the cap shown 1n Fig. 4; Fig. 6 is a section on the line 6 6 of Fig. 4.

The dust cap comprises two parts,-1 and 2. The upper part I call tne shell or body, and the lower part the head. The body 1 is formed from sheetmetal by drawing the same through suitable dies and may be given any desired cross-section sha e, as round, square, hexagonal, octagonai), etc. The body l is preferably formed of`stee1 which is sherardized and then nickel-plated, or given any other suitable finish, as may be desired.

The lower portion 'of the body l is formed to coperate with the head 2. This head is formedl as shown in the lower portion of Fig. 2,-that is to say, there is a threaded opening 3 extending through the central portion of the head, and surrounding the threaded portion `there is a groove 4 adapted to receive the lower4 end of the shell or body. The4 outer wall of the groove 4 ex? tends above the inner wall of the groove, as

is clearly shown in the drawing. The head 2 ner groove formed circular; and the lower part of the body 1 is trimmed 'so as to be circular and fit within the roove 4. The llower portion of thebody 1 1n this instance is formed .to have a slight outward flare, as `indicated in the lower portion of Fig.v 1. This outward flare is adapted to receive the upper portion of the outer wall of the head 2, while the shell and head are brought t0- gether. That is` to say, the metal which forms the upper portion of the outer wall of the head is folded or crimped around the flaring portion at the lower end of the shell Vso that the shell and head become a unitary body, and there is formed a dust cap, the head portionof which is of brass or other non-rusting and non-corroding material, .while the shell or body portion is formed ing such a dust cap the loodyl 1 is drawn to its hexagonal shape; the head 2 has its inof steel sherardized to protect it againstl with the stem is of a non-corroding material.

It it be desired, the head may assume a hexagonal shape, as indicated' at 5 in Fig.

ln this event the body l is formed the same as that previously described, and the head 2 is also formed the same as previously described, except that the outer portion is formed to have a hexagonal or octagonal or other similar shape, as desired, and thev outer wall of theinner groove is also given the same shape at the outside of the head. The outer upper wall of the head is crimped around the lower portion of the shell in exactly the same manner as has heretofore been described.

lt will be obvious, although not shown, that a round shellxmay be used with" such a head as shown in the lower' portion of Fig 2, in which event the-lower end of the shell would be `flared outwardly the same ashas heretofore been described.

ln Figs, 4l, 5 and 6 l have represented the dust cap as formed of a round shell with a hexagonal or sided base or head. lNhen such a cap is to be formed the shell is formed *Y as indicated at 6 of Fig. 5, in which'it will be seen that the lower portion is given a the parts, as shown in l? ig. 4, are assembled,

y the metal forming the upper portion of the outer wall of the head '7 is crimped around the lower portion of the shell 6, thus holding the head 7 and the shell 6 together as a unitary structure.

llt will be obvious that when a round head is used with the hexagonal shell that the foldingofthe metal ofthe head around the bottom of the shell will cause themetal of the head to be vfolded around the corners of the shell and so prevent relative inovement of the shell and head. ,Gf course,rin

the case as shown in Figs. 4f, 5 and 6, where:

Lasarte lsmaller than at present used on dust caps.

Having thus described my invention, what I claim is y l. A dust-cap having an elongated hollow body formed of sheet metal, said body being provided with a skirt portion surrounding an open end thereof, a head formed of metal, said head having an inner cylindrical screw-threaded wall portion, an

end wall portion and .an outer wall portion, the said wall portions losing integral and all of substantially uniform thickness, the Spacevbetween the outer wall and the cylindrical wall forming a groove which extends almost the entire length of the threaded wall portion, the said skirt portion of the body occupying the aforesaid space and the upper portion of the outer wall of the head being olded'against said body.

2, A dust-cap comprising a metal-body, one end of which is closed, the other end being open, which open end is surrounded by a'depending shirt, the skirt portion being formed with a plurality of walls hollow sheet l which extend angularly with respect to each other, a head member having an inner cylindrical portion the interior of which is screwthreaded, and having an outer wall which wall is 'formed with vangular sides comple? mentary to the sides "formed upon the skirt ot. the shell, said inner cylindrical portion and the outer wall being of substantially uniform thickness,- the space between the outer wall and the innerl cylindricalv portion forming a groove which extends substantiallythroughout the length of the threaded portion, said groove being adapted Ato receive'the skirt of the shell,and the upper portion of the Wall of the head being against the body ot the shell.

ln testimony whereof Ihereunto ax my signature.

'folded wanneer s. seoason. 

